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PYONGYANG, North Korea (AP) — North Korea is crediting its young new leader, Kim Jong Un, with spearheading past nuclear testing as it adds to a growing personality cult around him.

The North’s official Uriminzokkiri website said Friday that Kim “frightened” the country’s enemies by commanding nuclear testing in the past. North Korea tested nuclear devices in 2006 and 2009. But the website didn’t specify which tests Kim oversaw.

Kim took over after his father and longtime ruler Kim Jong Il died in mid-December.

His youth and quick rise have spurred questions in foreign capitals about how ready he is to rule. North Korea has in recent days said that Kim Jong Un had a lengthy behind-the-scenes role and worked closely with his father.